The branch radical and the branch kanji are the same! This kanji also means support. To remember it, think about a tree with lots of branches. The branches support each other and the trunk of the tree. If you were to climb the tree, the branches would be able to support your weight too!
You're happily sitting on this branch, letting it support all this weight, when a sheep (し) starts to climb the tree. A very, very big sheep. Uh oh... no no, sheep. If you get on this branch it won't be able to support all this weight!!!