EU Pre Settle Status and Divorce

Hi
My friend is Indian national. He got married with French national in June 2019.He has one son who is 3 years old .Wife and Son both have settled status under EU .He was granted EU residence card in 2020 for 5 years. He was granted 5 years pre settled status in Jan 2022 on the basis of marriage with EU national.

He is not in good relationship with wife and both are talking about divorce.

if they start divorce process what will be option for him ?

can he apply for Right of Retention or on the basis of his son?

what will be process

please guide