My parents do that to me too. I used to get so upset. My sister and I had a baby two wweks apart. My parents did EVERYTHING for her. They watch her son two or three times a week. He is so close to them. They didnt even watch my daughter until she was 9 months old!!! They had only seen her like 5 times! She didnt even know them.They still have only baby sitted like 5 times now and shes almost two. I didnt understand at first, but my sister is so irresponsible my mom just does whatever it takes to watch out for the kid. Shes so busy with him though she never realized she was barely around for my kids. My whole childhood, I was the responsible one who had to pay my own way, work, get good grades. My little sister got away with everything, got it all paid for and just had it easier. My older sister is the same way but she got married, moved and is on the outs with us a little right now cause she said a lot of REALLY bad stuff to us cause shes a moron puppet pulled along by her nutso hubby. So needless to so I totally know what its like and its hard to get over. Theres not much you can do about it because you cant change the sister and moms always watch over their babies. So, just remember its somewhat of a compliment, youre mom trusts you to take care of your kids on your own. Otherwise she wouldnt leave