“Is that your father? You don’t look anything like him at all!”
“Oh, I take after my mother. Everyone on my mother’s side of the family has this hair color.”

If you draw a line through the middle of your family tree, one half will be your father’s side—your father, his siblings, his parents, his grandparents, etc.—and the other half will be your mother’s side—your mother and all of her family. You and your siblings probably have traits from both sides.

「あれがお父さん?全然似てない!」
「私はお母さん似だよ。母方はみんなこの髪の色をしてるから。」

家系の真ん中に線をひくと、片方が父方(父とその兄弟姉妹、両親、祖父母など)で、もう片方が母方(母とその家族)になります。あなたとあなたの兄弟姉妹は両方の特徴を継いでいるでしょう。