I 100% agree with the others... If mom is not willing to actively help, she is actually hindering. It only makes it so much harder for the little guy. Try that approach, maybe? That it is actually harder ON HIM?
But even if mama continue these bad habits, eventually he will get the idea, and settle into routine at your house.
And, I cannot be the only one who thinks that a 10month old is perfectly capable of holding his own bottle/sippy? All 4 of my kids did by that age.