Reindeer, retard means arrested development.
Clearly retard is the best word.

Stunted growth.

I would never call a person with caused challenges a retard.
It is reserved for the retarded.

Socialists stuck mid level** in the maturation of understand in a political arena.

The average person moves easily through
the feeling stage of understanding and perspective.
The retard stops right there to live with feeling instead broader reality.
Often they are next Delinquent. Pointed. Short eyes. Disconnected.

No one is talking about you or your family which I will leave out of it.