I need to buy at least one bike this summer.

May make it belong to one or may have them share it if color and size appropriate.

Daughter is 15 and 5'8" Son 13 and 5'6".

I suppose I am looking for a 26" hard tail. $200-$300 Open to the idea of building something if someone has a frame and fork available.

Just want something that they will enjoy rather than something they get frustrated with because it weighs to much or does not function right.