What is the ruling on maintaining ties of kinship with relatives through suckling if the number of sucklings and the extent of satiety from them are not known with certainty after a long time has passed?

If the nursing mother has suckled the questioner for a day and a night, it is highly probable that the five prohibitive sucklings have occurred. The fulfillment of five sucklings is a condition because what is doubtful is not considered. It is not a condition for the suckling to be satiating, and the reference for determining a suckling is custom. If there is doubt about the existence of suckling or its number, prohibition is not established because the default is its absence. However, it is more cautious for the women to veil themselves from the questioner and treat him as a stranger.