Apologies for the rant.... But
Everytime she see my ds, even for a short visit she brings some sort of gift. I have tried everything from asking her to limit it to special occasions, to dropping hints about not wanting him to be spoilt to downright refusing to accept stuff but she NEVER LISTENS.
Her kids are so spoilt it's embarrasing and I dont want my child turning out rude and materialistic like hers. I don't really agree with the way she raises her kids but it's her right to do what she wants for her kids, as it is my right to make desicions about my child.
We have never really got on and I feel like this is her partly trying to wind me up which infuriates me because my child is being used in her silly games. It's not that I don't appreciate the gesture but all this gift giving no longer seems genuine, just a ploy to piss me off. Now she has taken to comin over to visit and then waiting till I'm out the room and pulling out the latest gift and giving it directly to ds so I can't really take it off him without being the bad guy. And she does it with a smirk on her face 
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Another thing she does is constantly trying to undermine my authority ..I don't allow ds to any sort of junk food and whenever my back is turned she is plying him with cake etc things a 15 month old doesnt need to be eating!!
The other day ds ate his food at a restaurant and I went to order him fruit for dessert, and as Im cutting it up I hear her sayin "oh u don't want that, do u want cake" and tried to give him cake off her plate. I said "no he is not allowed cake" and she still went to hand it to him and I actually had to physically take it out her hand!!!! What.the.actual.fuck
Then the other day she asks what i plan to get him for xmas and i told her...the next day i get a txt sayin she has just ordered what i ws planning to buy so "can i please not buy it aswell"
She is constantly trying to undermine and patronise me like she knows best and short of strangling her I don't know what to do. Believe me I am no wallflower and have put my foot down over and over again but she just ignores me...any advice on what I should do?? I refuse to let this carry on...