Tu padre es el mas simpático.
father-in-law - suegro
You already said it: Mí papa = my father/dad/daddy/pa/poppa.
Папа = PApa. I believe it's pronounced exactly like the word for potato is in spanish.
You say, "padres." It is, in fact, the plural of "father," however, it is understood in Spanish as parents: Mom and Dad. My parents = mis padres.
You can say "la hermana más simpática que nunca".
Dad: Babacığım Father: Baba
Far = Father Pappa = Dad
Father - Faðir Dad - pabbi
otousan
Hola papa.
Mi padre me enseñó
Hermana y papá