Can a husband and wife that are not able to roll their tongues produce a child that is able to roll his or her tongue?

Yes, it is possible for a husband and wife who cannot roll their tongues to have a child who can. Tongue rolling is often considered a genetic trait, but it is not solely determined by a single pair of alleles. Other genetic factors, including those inherited from previous generations, can influence this trait, allowing for the possibility of a child being able to roll their tongue despite both parents lacking that ability.