if your filling in pedigree papers it would not look too good having the daughter bred into her dad and inter breeding causes health issues and doesn't clear any old issues like dodgy hip displacement that might be hiding it just passes the same onto the pups...
check living conditions before letting it happen... some breeders need putting to sleep only doing it for the money and the pups leave sick .. make sure you get pic of the litter and on collection should be already wormed jabbed for Parvo Virus and chipped .