Father transfered his personal residence to his daughter and son and set up a life estate in 1980. The house was sold in 2020,

1. Form 1099-S for net proceeds was only issued to his son. What is the best way to  report father or daughter's portion gain on his son's return?

2. Son's basis to calculate the gain: The adjusted basis at the time of life estate set up multiplied by the percentage in IRS tables at date of life estate set up. Is it correct?