I have sympathy! My children are 10 + 5 now, and I still get the odd comment from "well-meaning" family!
When my dd started school my in-laws used to make fun of the fact that I ensured she got her homework done every week at age 5, saying surely it wasn't necessary. If ever homework wasn't done you would always get a "teacher's comment" in the contact book to finish it next week, so I always made sure she did it!
My dd did very well in her SATS this year, (now aged 10) + instead of getting a "well done" from the in-laws, they just said, "Oh, she did well because you're a pretty laid back mum, she's never felt pressure from you with school work so she's decided to motivate herself"!!
Before her little brother started school if I walked him up there to meet her, people would say, "Oh, poor little thing being made to walk, Mummy should have brought the pushchair!" If he was in the pushchair I'd get, "Cruel Mummy strapping you in there, you should be running around!"
It does get to me but I hope I've developed a slightly thicker skin over the years!!