I have a 3.5 yr old DS and a 1yo DD. Although I previously had a great relationship with my mil, it started going downhill when I fell pregnant with DS. I find her completely overbearing: she would come and stay with us, we coslept with DS, mil would just walk into our bedroom at 7am when she heard him stir despite the fact that I would be in bed naked feeding him. She always demands time alone with DS, insisting he goes to her for sleepovers. She buys him loads of toys, even though we specifically ask her not to as we don't want our kids swamped with things. She shows very little interest in DD but tells DS he is her reason for living (way too over the top for a 3yo!) Anyway, this is just background.
My problem now relates to her giving him sweet foods. We try and minimise how much sugar he eats and have asked her so many times not to give him cakes, sweets etc. It falls on deaf ears. At one point I called her and had a very sensitive conversation with her about how the dentist recommended no sweet foods and how it's hard to achieve that in this world and would she mind awfully helping me out with that. She did seem very on board with it. However soon after she started giving him little sweet treats again behind our back, which has now built up to giving him half a full size battenburg cake, a full pack of jelly babies, sweet yoghurts, a gingerbread man all in the space of one day at her house. He comes home completely wired and always ends up in trouble with us for being 'naughty' but it's not his fault he's on a sugar high! Now she has just started doing it in front of us. DH confronted her again about it and she got all sulky, talking about grandmas rights etc. I don't expect things to change now as we've had so many conversations about it. It feels like she is deliberately disrespecting our wishes and is deliberately pushing our boundaries in the same way a toddler would. I want to know my children are being given generally healthy foods when they're away from me (with the very occasional small treat) but it's just not happening. Also, she seems to have her own eating issues: she always denies she ever eats sweets and cakes but her cupboards are full of them and she has empty packets all over the place so she seems to be in denial about it. She is extremely obese and has loads of related health problems like diabetes etc. I fear that her food issues are impacting on my children Am I being unreasonable to consider stopping my DS staying over at her house alone?