My mom was always skinnier than I am. I inherited my father's (actually his mother's) body type - the Germanic, round, pink cheeked side of the family!
My mom was tall (5'10"), slim (always naturally around 130 lbs), with an athletic build (small boobs, narrow hips).
I am 5'4", inclined to gain weight around my hips and tummy, have boobs, etc.
After about age 11 or 12 I stopped being able to wear her clothes because my chest got bigger than hers!
Shortly after that, everything except my height increased! Even when I was at my slimmest in college (123-ish), I couldn't fit into her clothes.
But then her father and her 2 brothers were all over 6'. And my younger brother inherited her body type as much as I inherited my fathers - my brother is 6'3" and a solid 200lbs of muscle. He's always been athletic and stayed trim. The BRAT.