Does the father also need ot look out for how he shows physical affection at this age?

The halacha is very clear on this matter. According to the poskim, once a boy reaches around 12 years old and is approaching bar mitzvah, there are serious restrictions on physical affection - not just from the mother as we discussed, but from the father as well. The Gemara in Masechet Pesachim teaches that a man should not bathe together with certain relatives, and this includes a father with his son once the boy reaches a certain age. The issue here is tzniut, modesty, which applies even within the family. A boy at this age cannot look at his own father in a state of undress, and certainly the father must maintain proper boundaries as well. This doesn't mean a father cannot have any physical contact whatsoever, but the nature of it must change. Touching that is not affectionate - for example, to guide him, to restrain him if necessary, or for a practical purpose - can still be done. But excessive hugging, kissing, and the type of physical affection appropriate for a small child must stop. The boy is becoming a man, and he needs to be treated accordingly. At 12 years old, this boy is going through major hormonal changes, and his yetzer hara is awakening. The father's job now is to teach him the halachot of modesty, not to continue treating him like a little child. By age eight, you should already be teaching a boy about modesty and how to conduct himself properly. You need to have conversations with him about protecting his brit and all the issues related to growing up as a Jewish man. A father who continues with excessive physical affection at this age is doing damage, not good. The boy needs to learn proper boundaries between men, proper conduct, and how to be modest. He's preparing for bar mitzvah - he's becoming responsible for mitzvot. Treat him with the dignity and boundaries that reflect his new status as someone approaching Jewish manhood.