Looking at tiny data samples like someone's relatives is not smart.
There are a lot of confusing issues at play.
People like Grizz are all over the net spreading false information.
Being small or normal size is, well, normal. It's only in the last hundred years or so during industrialization gone wild that we have this concept of people like Schwarzenegger as healthy. These types of people are aberrations.
There are two types of small. Lithe and healthy small, and malnourished small. If you are constantly struggling with keeping weight up then you are malnourished small. There is nothing wrong with lithe and healthy small. Most) people in the world (asians) have small builds. Americanos are porcine. Like the title says do you want to look like a pig? Great then follow advice from people like Grizz.
A guy like Grizz will sound off about his giant goiter neck being normal, but this is indicative of the times we live in. You need to consult your inner self as to what you believe is normal. In my universe giant goiter necks are not normal, even if you are born with one. It just means you were born unhealthy. Lots of people are born unhealthy these days.