gumusut, sorry to hear about your problem.

from a legal perspective, when the driver swerved to avoid the child, he was justified in hitting the tricycle because this caused less harm (though it may have been unintended), hence at least you know there's no criminal liability but only civil liablity for the damage.

on this point, i take it you have already restored the tricycle to its original state by fixing it. hence wala ng ihahabol yung tricycle driver dahal kung ano mang damage sa kanya, indemnified na siya. mag file man siya ng kaso, wala na siyang mahahabol.

parang naghahanap lang ng balato yung kumag. you can take the active route and deny his claims in some way (lawyer's letter, harsh text) or just have your wife and driver change their telephone numbers. good luck.