My GS who is 3years 6 months is becoming overweight, he weighs 18kg and is 98cms tall. My DIL is a great and devoted mum, I am impressed by her aside from how she (and my son) feed my GS. It all started so well, he was EBF then at 6 months they introduced BLW, however in the last year or so his healthy diet seems to have been largely replaced by what I can only describe as rubbish, chips very frequently, sausages at least twice a week all smothered in ketchup, sugary cereals, cake, crisps etc etc. I get on well with my DIL, she is very confident in her parenting and has never asked for my advice over anything, I am not an overbearing MIL and have told her on many occasions how lovely a Mum I think she is, my GS is gorgeous, happy, chatty, interesting and interested, I adore him and am lucky to live fairly near and see him frequently.
My DIL is overweight by about 3 stone, her parents are both overweight, her only brother is overweight and his daughter of 13 years is overweight (resulting in health problems) My son is not overweight nor is anyone else on "our side" of the family.
My dilemma is whether I should say anything to my son, who I know would tell my DIL, I do not want to risk my good relationship with them but I feel worried that my wonderful little GS will face problems caused by obesity, I am concerned that my DIL sees it as normal because of her family who she is very close to.
So advise me please, would IBU to raise my concerns.