Mother in Law moving in?

Michelle • Baby 💗 born 6/11/17 & 💗 born 8/27/19
My husband and I have been married for three years. His mom is newly divorced after a 40 year marriage. She is very lonely! Anyways, my husband and I are house shopping. We are considering buying a big enough of a house for she can move in with us. Am I crazy for considering this?! To add, my mother in law is almost 70 and she needs help with day to day things. If she were to move in we would have 5 total dogs. (talk about a zoo!) My hubby and I both work full time and are ttc. Just thinking toward the future it would be nice to have her available at all times to watch the baby, let the dogs out, etc. when we are at work. I need some advice for this huge life decision!! If it didn't work out we could always adjust..my mother in law and I get along very well to add! Thanks in advance!