5C

Fifth-cousin.

I don't know my 5C.

3C1R

Third-cousin-once-removed.

I don't know my 3C1R.

9C2R

Ninth-cousin-twice-removed.

I don't know my 9C2R.

10C1R

Tenth-cousin-once-removed.

I don't know my 10C1R.

10C4R

Tenth-cousin-four-times-removed.

I don't know my 10C4R.

2C10R

Second-cousin-ten-times-removed.

I don't know my 2C10R.

8C3R

Eighth-cousin-thrice-removed.

I don't know my 8C3R.