If i wasn't interested in the estate or any money then i wouldn't personally be getting involved with it and leave it to the rest of the family to sort given there are implications with involving yourself as others have mentioned.
Definitely this if you are going to involve yourself though.
@baz178 - Having had to do similar recently, get a solicitor to at least handle any will, probate, court costs and pensions (they'll do a better job at chasing them especially if they're old and companies have merged/been taken over etc) as it will save you a few headaches.
Bank accounts and bills is now mostly online form filling or emails, and/or contacting bereavement departments but it's all fairly straightforward compared to everything else.
Someone mentioned getting loads of death certs., my experience is that most places were happy with a scanned copy being either emailed over or included as an online form attachment. We've only physically used three or four of them.
She wants the money for our child not for her self.