A person(guy or girl) who thinks he or she is a gangster, because someone in their family( cousin, brother, father, etc) is part of a gang. This person is highly pathetic and brings shame upon their non-gang affiliated family members.
Here is the way you can tell if someone is a Relative Wangster.
1) He or she will act like they can beat up anyone no matter what gender they are( kind of like those girls who think and act like they can beat up any guy or girl)
2) He or she, when threatened, will say that they will get their *insert gang affiliated family member here* and that they will gang up on you
3) Finally, he or she will talk shit about people who have either already beat the crap out of them or someone who they have never fought before.