It is not legal. If the 16 year old engages in any sexual conduct, they could face statutory rape charges and the parental consent assuming there was any would have no bearing on that.
Can a 16 year old date a 14 year old UK?
It is a criminal offence for anyone who is 16 or older to have any kind of sexual contact with someone aged 13, 14 or 15. It is also a criminal offence for both girls and boys aged 13, 14 and 15 to have consensual sex with anyone else aged 13, 14 or 15.
Is a 16 year old dating a 14 year old OK?
Dating is not illegal. Sexual relations can be. If you are not 4 years older it is not statutory rape. But there is coercion that could be alleged now or later if she gets upset.
Can a 25 year old date a 16-year-old?
Dating is legal but you are not of an age to consent to sex at 16. However, even though it may be legal, it is still not a good idea. Your parents could also try getting a restraining order against him.