(dialect) father; old man; sir

adoptive father (traditional adoption, i.e. without legal ramifications)

dad; father; (paternal) grandfather; old man

daddy; granddad

biological father; real dad

husband's father

to get one's father involved in a difficult situation; (vulgar) (of sth that makes one feel misled or let down etc) to be a big disappointment

husband of father's sister; uncle

(slang) to rely on one's father's wealth or prestige to get ahead

satay (sauce)

(slang) sugar daddy

(vulgar) a man sb's mother has an affair with

(neologism c. 2012) (slang) to become a stepfather when one's partner turns out to be pregnant with a child she conceived with another lover