Well Meerkats I think I can state here and now that there is no freakin' way I will be doing my ds's cleaning for him in 36 years' time He'll be welcome to come round and do mine if he likes, though. Honestly, the woman who ends up with your bro is going to have her hands full re-training him, isn't she? (Or just accept that he's always had everything done for him and do the same).
I would be devastated if it was my mum showing no interest in my kid(s), that's definitely in a class above my FIL and his grumpiness (as I never have to see him, it affects me very little, and as ds has my excellent step-father as a fine grandad, we don't really notice the lack anyway).
As to emotionally needy, that's my MIL. I know why my dh lived abroad for 12 years! (Have been tempted more than once just to high tail it back to Sweden to get away from them). What happens is my BIL phones her, to offload all his stress on to her, which then stresses her out, so she phones my dh to offload it all on him. (Note comment before about him being chronically ill, apparently that is no reason not to offload stress on to him. I know I do but (a) I'm married to him and (b) I have just had his grumpy baby for him!).
Dh then gets stressed having to try and placate his mum, which then stresses me out too because I don't like to see him get upset (unless I am doing it) - all I can say is, whoever invented Caller ID should be given a Nobel Prize. We also have a fabulous privacy feature on the phones which, when we turn it on, means only my parents can call and everyone else goes straight to answerphone. Aaahhh, bliss.
I hope your MIL is a bit more interested in her grandchildren, what a shame for them not to have fab grandparents. My mum loves being a granny because she gets to dote on the kids and allow them to do all sorts of horrendous things she wouldn't let us do, and my sibs won't let their kids do That's what it's all about. As you say, though, there's nothing you can do about it - and it's 100% your parents' loss.