Should I give my mother-in-law the key to the new house?

Mother-in-law wants you to give her a key, because it shows her importance to you. She will be very happy to have the key, and it will also ease your previous conflicts, but you can tell her husband before giving it to her. You give the key to your mother-in-law, but you don't want her to come all the time when she has something to do, and you don't want her to come to our house without knocking.

Of course, it doesn't matter if you don't give it, but if you are a caring mother-in-law, she just has a knot in her heart.