A free app for Android, by Avatar Maker.

Family Tree, Photo Collage Maker is a handy app that will let you create cool family tree collages in just a few seconds. It is a very simple and intuitive app, so you won’t have to worry about anything. All you need to do is simply select the photos from your device and then choose the background and other elements. You can also change the size of the elements and the distance between them.

Once you are done with the creation, you can save it on your device or share it on social media. You can even add some text and stickers to make it more interesting.