(NIL = Nan in law)
I am starting to get really fed up with FIL for several reasons, Firstly when DS stays round his sometimes on a Saturday night he gets him about 3 packets of sweets and bottles of fruit shoots to eat and drink all night.
He never eats his dinner because FIL just lets him get away with no eating it and gives him sweets anyway.
Lets him get away with murder, so when he comes back the next day he is uncontrollable fuelled with sugar and been let to do whatever he wants.
Also eh doesn't seem to understand how much DS's behaviour gets to me and DH.
When he misbehaves FIL just says oh he's all right !!! 
The other day I put him onto his naughty place to calm down as he threw a paddy for no reason, FIL then came round and was like oh he's al-right and when and spoke to him and said oh its OK DS.
The trouble is I don't want to say anything to him as he will get offended and not want to look after DS any more, in-case I say anything probably, and without FIL I would never ever get the breaks I so well need.
How do i aproch this !!??
Also another little rant about NIL.
We went over to visit the other day, DS was in the garden with GD, and NIL said "oh when is DS going to get a little play mate" Was just about to answer soon maybe.
The she came out with this to DH "Oh you will probably be like you father and only have the one mistake and not bother with any more" !!!!
Is it just be or would you take real offence to that comment.