I am gonna try and keep this short.
My next door but one neighbour has asked that once my DD1 starts nursery at the local school (tomorrow eeeek, as we have had to give notice at the private nursery she went to) that when he send his DD there can I drop off and pick her up.
I have said no for many reasons;
One, being I do not want to be tied down with or the responsibility someone his DD.
Two, I wont always be coming straight home after picking DD1 up from nursery.
Three, his DD is VERY hard work and has to be watched to make sure she doesn't hurt DD2 which she seems to do A LOT if I ever help him out.
Four, he ever reciprocates (not that I would ever ask him though, but that is beside the point)
Five, His DD's mother (he has full custody and her mother has supervised access with him present) is a fucking nutter and I know if she saw me with her DD, would kick off big style. I do not want that hassle, I do not what my DD's to see that and I don't think her DD would like to see it either.
Six, he doesn't work and has said himself that he has no other commitments apart from his DD, his dog and the house, so I don't see why he cant do it.
I am sure I will remember more reasons later 
I understand that I will be going to and from the nursery anyway, but I don't want to be held in a 'contract' as it were to take and collect his DD.
I haven't told him any of the above reasons as he can be a bit of a loose cannon if he does not get his own way. I have unfortunately been on the receiving end of this before when I told him I couldn't babysit his DD while he made an important telephone call
as I had my Nana for the afternoon and as nana has dementia I have to keep an eye on her and the DD's quite closely. He kept saying that it was only an hour!
There are many similar stories to this one as well, but I fear I have already gone on wayyyyyyy too long.
AIBU?