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When someone is genetically identical to someone else they are called twins, triplets etc.
Someone who picks on someone else is called a bully. They are not nice people.
When someone else writes about someone who is deceased, it is called a biography.
Envious.
AutoBiography
• Someone who interferes in someone else's life is called a 'meddler.' Obviously.....
a babysitter
Tenant
imposter
A 'Player' can also be called a cheater
Pacifier
jealousy :)