Keep your children connected with your Mother tongue

I am a former government employee with an experience of 8 years in Agronomy. I did my master's in Agriculture. I have always loved my mother tongue and now looking forward to doing something about it.
I have seen kids who are struggling to speak their mother tongue. I always say learning languages is awesome, but we must stick to our mother tongue. I am a proud mother of 2 kids and have always told them to speak their mother tongue at home.
They speak English and learn french too.