All kids are worse for their primary carer.

When does he do this? What context? Working out what the situation is and what he may be trying to express to you might be the key here

In most cases, toddlers bite because their language skills are still developing and it’s simply another way to express how they are feeling. Unable to quickly form the words they need to convey their thoughts, very young children may resort to biting as a way of saying, “Stop that!” or “I need some attention!”
I think this may happen because your toddler’s mind can’t make sense of your behavior. He may feel alone or scared or want to seek your attention.

Kids test their parents in different ways. If you’re both very consistent in your expectations of him, this should reduce over time.

He could be acting out as he sees you leave him. Weirdly enough kids seem to see dad as the boss and mum as someone they can mess around with. Keep telling him ouch and that it hurts mummy and hopefully he learns, otherwise maybe if dad ever sees him to tell him its bad and that daddy will never hit mummy so hopefully he copies.

For whatever reason children will often push boundaries with mum but not with dad.

He misses you and this is how he shows it, he can’t verbalise it

Things will and should change as time goes on! With his dad he won’t push boundries but with mum maybe he can get away with it :).

My boys Is 26months and all he does is hit me, pinch bite slap but never his father we are both nearly always home so I don’t think it’s got anything to do with how much time you are there. It should hopefully just blow over.

what does Dad do while he minds your son. play with him.? Bit like goodies and baddies and maybe he sees end of fun when you come. Do some nice stuff and chatter with him, know it sounds like bribing but (guess what Mummy has in her bag for you? nothing big a little treat.Hope this helps

for whatever reasons I think children know that dad’s mean business. We do equal discipline in our house but I admit for reasons unknown the childrens reactions are always to stop immediately whatever they are doing wrong when dad speaks. When I speak it can take two or three times and result in a time out. I think at the end of the day its all about testing boundries. Be firm and always carry through with threats i.e if you do that again you will go for a time out.

he knows your a softy and dad would probably smack him or yell

dad must come across stronger …

My children also do this to me. They’re naughty for me but good for other people. They’re testing their boundaries.

maybe your not strong enough with him