style - How to deal with cliche dialogue?

The following is from a story I'm writing:

"Goodbye Choco," my mother said, to end the prayer, “may your soul rest in peace,” and crossed herself.

“Sorry I couldn’t come earlier,” I said. “I’ve been busy.”

“That’s alright, sweetheart. You selected more courses this year?”

“Actually joined a club.”

“Oh, that’s great. You’ve never joined a club before, right? What’s its name?”

“Animal Self-Destruction Observation Group.”

“That’s good. A club that’s not from your department. A completely different experience.”

“Yeah, I like variety.” Luckily my mother wasn’t ‘attentive’ enough to catch the meaning of complicated names.

“Is it fun?” Mom asked. “What do you do there?”

“Well, I don’t know yet—but I’ll find out tomorrow.”

"Please take care in the camping. Did you pack your clothes, sun blocker, your Hello Kitty doll?"

"Mom, I'm nineteen."

"You're right, honey. Sorry. Sometimes I forget you’ve grown up."

"I've noticed that."

“I know sometimes you think I worry too much. But all parents are like that. All we want is for our children to grow healthy and happy. Especially happy. I hope you understand that.”

I nodded. To grow happy. I wondered how Mom would have felt if she’d known I almost committed suicide. How she would have felt if she’d learned I’d been unhappy most of my adult life. The thought stabbed right into my heart. But, well, that was a thing of the past—an ancient tomb buried under layers and layers of sand. At least for the time being.

So the MC and her mother are in the backyard performing a burial for their dog. I feel the mother talks too much like a 'mother' from time to time. I can change it. The problem is that what she says is essential to the plot/theme (suicide).

Is there any way I can work this around?

Answer

1) Lengthen it. You're not going to have rat-a-tat-tat patter graveside.

2) Take each phrase you feel is clichéd, determine the meaning, and rewrite it in different words. "All we want is for our children to grow healthy and happy" becomes "That's my biggest responsibility and my biggest hope — that my children are healthy and happy, and we didn't break them too much on the way to adulthood."

3) Try the exercise I recommended in my answer to this question, where you and a friend ad-lib the scene and record it. Play it back and see how real, unscripted dialogue sounds.