Hello

I want to learn english. And speak with my yearlings.

Do you mean your equals in age, your peers?

Я думаю, что речь идет о сверстниках, ровесниках, детях двенадцати лет.

Hello

I want to learn english and speak with my siblings.   (if you are talking about your brothers and sisters.)

I want to learn english and speak with my children.   (if you are talking about your children.)

Hello

I want to learn English. And speak with my yearlings.  ??

The second sentence is linguistically possible, but I don't know for sure what you mean.  A "yearling" is almost always used as a word for an animal, often a horse, that is one year old.  Very rarely someone will refer to a human child of that age a "yearling."   If you paraphrase in English, or write the sentence in Russian, I'll try again to help.

Hello

I want to learn english. And speak with my yearlings (12 years).