International marriage Whatsapp struggles

i'm from the US but married to a Brazilian and we live in Europe now. Her big extended family is super active on whatsapp and the group chats are almost entirely in Portugese. Even though I can speak some, when they're all chatting quickly with slang and inside jokes I get completely lost. It makes me feel a bit disconnected from her family. Anyone in a similar cross-cultural relationship found something that helps?