Non resident with family members in UK

I am holding a British citizen passport which comes from my father, but I am not born in UK and have never lived in the UK. I used to live, work and pay tax in Australia. My wife and children are currently studying and living in UK. I have some questions below, please clarify. 1) What is the maximum length I can stay in UK with my wife and children so that I won’t be a tax citizen in the UK? 2) Is there any amount limit that I can transfer money to my wife and children which will not be taxed by UK?

Hi
1. it would need to be less than 183 days   
2. no as this is living expenses
Thankyou.