cognate

cognate [ KOG-neyt ]
[ noun, adjective ]

MEANING :
1. (adj.) related by birth or descended from the same parentage
2. (adj.) descended from the same language
3. (adj.) similar or allied in nature or quality
4. (n.) a person or thing related by origin or by blood with another
3. (n.) a word in one language related to a word in another language

USAGE EXAMPLE 1 :
The pauper was actually a cognate of the prince that is why their features were so amazingly similar.
USAGE EXAMPLE 2 :
No exchanges between Poland and Germany either on Danzig or cognate subjects have taken place