I'm glad he's my little brother.
Meaning: This means you are happy and grateful to have him as your younger brother.
Choice of Words: Glad means feeling or showing pleasure or contentment. He's is a contraction of 'he is'. My means belonging to or associated with the speaker. Little means small in size, amount, or degree. Brother means a male sibling, someone who shares one or both parents with you.
Alternative Expressions
Related Expressions