Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word: Your wife does everything for you. She feeds you, she bathes you, she cleans up after you and even wipes your butt when you poop. Really, she is doing too much (つま), and you should stop being a baby.
For my wife's birthday, I got her a seaplane.
My wife went to Koichi's concert and she said it was fantastic, though her seat was in the last row.
My ex-wife says, "You’ll never find someone like me." Well exactly! That’s the plan!