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.
- alcoholimeter
- alcoholimetric
- alcoholise
- alcoholised
- alcoholism
- alcoholist
- alcoholization
- alcoholize
- alcoholized
- alcoholizing
- alcoholmeter
- alcoholometer
- alcoholometric
- alcoholometry
- alcohol poisoning
- alcohol problem
- alcohol treatment
- alcoholysis
- alcohometer
- alcometer
- alconorque
- alcoolature
- alcoolize
- alcopop
- Alcoran