This is the 2727th most frequent Turkish word.
çocuklarıyla
"With their children"
Here, 'çocuklarıyla' is used to indicate that the subject is accompanied by their children.
O, hafta sonu çocuklarıyla parka gider.
He/she goes to the park with his/her children on the weekend.
In this sentence, 'çocuklarıyla' specifies a shared activity performed together with the children.
Çocuklarıyla birlikte yemek yapmayı çok sever.
He/she really enjoys cooking with his/her children.
Here, 'çocuklarıyla' shows companionship during the traveling or visiting activities.