The Menandore-Sheltatha-Sukul thing I don't think is wrong. AFAIR, the only reason we think of them as "sisters" is because of the Tiste Edur mythology (the same mythology that labels Scabandari as Father Shadow, which no one else seems to do). Our flashback from Udinaas in MT revealed that Sukul and Menandore are daughters of Osserc while Sheltatha is a daughter of Scabandari. Even then, they could all have a common mother (Tiam), and be biologically half-sisters. Or, it could just be that the Edur mythology is wrong.
Phaed, on the other hand, is a bit tougher. Here's the actual quote from The Bonehunters:
Quote
'No they ain't. See the tallest one there, with the long white hair.
His name is Nimander Golit. And that pretty woman beside him, that's Phaed, his first daughter. All seven of 'em are cousins, sisters, brothers, but it's Nimander who leads, since he's the oldest. Nimander says he is the first son of the Son.'
'The what?'
'The Son of Darkness, Banaschar. Know who that is? That's Anomander Rake. Look at 'em, they're all Rake's brood – grandchildren mostly, except for Nimander, who's father to a lot of 'em, but not all. Now, maybe someone's got a hate on for foreigners – you really think that someone would be stupid enough to go after the whelps of Anomander Rake?'
Banaschar turned slightly, stared over at the figures. He slowly blinked, then shook his head. 'Not unless they're suicidal.'
'Right, and that's something you'd know all about, ain't it?'
'So, if Anomander Rake is Nimander's father, who was the mother?'
'Ah, you're not completely blind, then. You can see, can't you?
Different mothers, for some of 'em. And one of those mothers wasn't no Tiste Andii, was she? Look at Phaed-'
'I can only see the back of her head.'
'Whatever. I looked at her, and I asked her that very same question you just asked me.'
'What?'
' "Who was your mother?" '
'Mine?'
'And she smiled – and I nearly died, Banaschar, and I mean it. Nearly died. Bursting blood vessels in my brain, toppling over nearly died.
Anyway, she told me, and it wasn't no Tiste Andii kind of name, and from the looks of her I'd say the other half was human, but then again, can you really tell with these things? Not really.'
'No, really, what was the name?'
'Lady Envy, who used to know Anomander Rake himself, and got her revenge taking his son as a lover. Messy, eh? But if she was anything like that Phaed there, with that smile, well, envy's the only word – for every other woman in the world. Gods below… hey, Banaschar, what's wrong? You suddenly look real sick. The ale's not that bad, not like what we had last night, anyway. Look, if you're thinking of fillin' a plate on the tabletop, there ain't no plate, right? And the boards are warped, and that means it'll sluice onto my legs, and that' ll get me very annoyed – for Hood's sake, man, draw a damned breath!'
Now, keep in mind this is all the drunken ramblings of Braven Tooth as interpreted by Banaschar, who is infinitely more drunk, but nevertheless from the above here's what I get:
--Nimander is Anomander's first son
--*most* of the rest are Nimander's own children
--Phaed is Nimander's first daughter
--Envy is Phaed's mother (implied)
And yeah, in contrast, after tBH all the Andii of this group seem to be brothers and sisters, all children of Rake rather than grandchildren. Nimander seems a lot younger, too, not like someone who has fathered a whole bunch of children he is travelling around with. Granted Tiste Andii are not human but it is still pretty uncharacteristic.
So, in order to justify the differences between these different depictions, you basically have to conclude that Braven Tooth is horribly wrong on every point he makes... in which case what was the point of reading that scene in the first place?
This isn't a perfect series, there are little inconsistencies here and there. Balgrid goes from being a Shadow mage to a necromancer from HoC/tBH to RG. Saltlick teleports between two different squads in RG. The 9th Company gets called the 4th Company. Orfantal changes genders from GotM to MoI (in some editions). Duiker has but hasn't met Pormqual? There were how many Jaghut wars again? Lorn had a deep and personal friendship with Toc the Elder when she was 2 months old?
Sure, you can devise ways of explaining anything away...
{ Balgrid just never mentioned being a necromancer before, Orfantal is a closet transexual and all the other Andii support it, Saltlick has a twin brother and no one can tell them apart, the T'lan Imass armies each have their own tally, Duiker met a Pormqual imposter in a brothel, Lorn writes erotic Toc the Elder fanfic in her spare time, SE deliberately wanted the narrative voice to use the wrong Company numbers in order to instill a sense of drunken fluidity and intransigence in the reader thereby subconsciously subduing the reader's natural sense of foresight and heightening the carefully sculpted emotional tapestry that would soon come all of which is obviously SE's way of paying tribute to Homer as it mirrors the reverse literary technique used in line 14712 of the Odyssey }
...but it is probably a lot easier and saner to accept that there are going to be a few inconsistencies in this series that just plain don't make sense.