So my husband and i have been together for almost 10 years (married for 4 years), but mother-in-law still has pictures of my husband with his ex-girlfriend, one in the livingroom and another in one of the bedrooms, it bothers me but I don't know if i should say something because it's not my house. What should I do?

Edit: My mother-in-law and I "do get along", we are not best friends, we have very different personalities, she is very high strong, I'm more accommodating and the type of person who usually avoids condlicts with others, and maybe thanks to that we've never had a fight.

This girl was his girlfriend in college, but after graduation they had to go separate ways and decided to split, so no bad feelings between them. One of the pictures is just of them in front of my in-laws' house. The other is from their graduation.