Weirded out

Ok so wtf. I went on my ex's fb page and I saw that on top of adding over 1000 girls (whatever don't care) he added one of my friends and one of my female family members. I'm weirded out. There is no way in hell he could know my family member, so how did he find her or why did he send her a friend request? Unless he's just mindlessly adding every girl that pops up on "people you may know." Or he's going through my friends list and adding some. I just don't even know wtf.