Parent said he has natural immunity, can you cite any evidence that you can get covid twice? If not then people who can prove natural immunity don't need the vaccine and are just risking their health for nothing.
If you want sources I will find them, but there are studied and not simply anecdotal instances of multiple infections of covid, yes. The outcomes range somewhat across the board from subsequent risks of severe infection or death, in a way that resembles vaccination.
However, from said study : "First, reinfection was not confirmed through whole genome sequencing, which would be necessary to definitively prove that the reinfection was caused from a distinct virus relative to the first infection. Although in some cases the repeat positive test could be indicative of prolonged viral shedding or failure to clear the initial viral infection (9), given the time between initial and subsequent positive molecular tests among participants in this study, reinfection is the most likely explanation"
Do with this as you will, but it seems there's nothing concrete. "most likely explanation" isn't good enough to force people to get an emergency use, rushed vaccine.