This may seem a little silly but I have a question that has been bothering me. We own a company that is in the process of being sold and I have to work much more than I would like. I'm lucky in that my mother-in-law can be with the baby (he is only 2 months). I'm worried that he will start seeing her as his mother. Am I being silly?
Feelings of wanting to be with your young children are totally normal and appropriate and your fears of being forgotten or unimportant to your children are normal too, given the separations that each of you face. I'll try to calm your fears here; you will ALWAYS be the parents of your child.
You will still see your baby, presumably, every day. He won't run the risk of forgetting you. He will attach to your mother-in-law -- and that's great and appropriate. You want him to feel close with his primary caretaker. Your jobs are: to not express your jealousy, to avoid undermining your mother-in-law, and to keep loving your baby and spending as much time with him as you can.
You have your entire lifetime to be his mother. This short time period will pass. Have confidence that you will only build your bond over the years to come.