i clos finishing my first tribe just have 3 collectibles to find an one tech to get. but i never get triple birth. i saw it in statistics but i still didn't get one lots of twins yes, but no tribles.

You need to purchase a certain tech. And then hope you'll get triplets on it.

i all done all techs apart from last exploration. so is it that tech?

Nope, you've got the right tech. You don't need level 3 exploration!

I've gotten all the techs. I have 10 out of 16 puzzles and my population is close to 70. I have only had twin births, never any triplets. Don't understand what I am doing wrong. Do the puzzles effect births?

after you have the right tech you just need to hope it happens. i believe its just random. i haven't had any yet in this game yet but plenty in VV1

Yeah it's definetly really random. I had a triplet (my only one so far), before I had twins. I've completed all the puzzles and collectibles and techs, but haven't been able to get more triplets. I had that first set of triplets on a population of about 30, but only a few twins since.
The only thing I think I have figured out is that it directly links into who the father is.. Certain villagers seem a lot more fertile than others...

I had several sets of twins before I got triplets. And so far, only one set of those. (There was a strange little chime right when it happened, too!)

no twins no trps , all puzzles dones , and one tech to buy and a few butterlies pebbles and shells, have master parents, but just more babies not even twins ? maybe I should start breeding the onss with No qualifications, they seem to have more babies in my neighbourhood!!! lol ,

that was meant as a joke, My mum one from a familiy of 9 kids before anyone takes offence!

It is extra hard in VV2 - because they 'parent' so extensively once they 'learn' that skill, the village count never goes 'down' to allow for 'selective' 'embracing' of specific villagers. BUT, in VV1 (and I hope it's true in VV2 also, 'cuz I want to try for more triplets), if you found a young (18-20 yr) girl and paired her with an 'older' gentleman (46-50-ish years), triplets were more frequent.

Doesn't happen as much in the new game because if you set their 'skill selection' to parenting, there's couples all over the island constantly 'embracing' and going in doors, so you never have a village count below the max long enough to selectively 'pair up' couples to try for trips.

I only have one set so far in VV2 and I've finished all the puzzles and most of the collections. Lots of babies, many twins (and I wish they'd bring back the twin counter in the stats) but only one set of trips.

I love this game!!