blood relation 
(also blood relative)
noun
A person who is related to another by birth rather than by marriage.Which do you think is the blood relative and which the relation because of marriage?...
- Christopher isn't a blood relative of Tony's, but rather an in-law.
- Even though he is not your blood relative, since your parents are married, you two are family and will always be in each other's lives.
- nominal value
- nominate
- nominated Parliament
- nominately
- nominate species
- nominatim
- nomination
- nomination borough
- nominative
- nominative absolute
- nominative case
- nominatively
- nominativus pendens
- nominator
- nominatum
- no-mind
- no-mindness
- nominee
- nomineeism
- nominis umbra
- nominy
- nomism
- nomisma
- nomistic
- no mo'