My handwriting has evolved over the last few years. It's become 'difficult to read', people say. I don't know. Of course, i can see the difference, but i don't know how it came about. It resembles father's to some extent. I think i write some letters like how he does - specially the 't' and the 'i'.
I don't know if M's handwriting also looks similar to father's. I haven't read anywhere of a genetic link between the parents and the offspring with respect to this. Maybe it's just my way of writing.