Thank you for the above good site that should help to put the doubter’s questions to rest , unless the sin of giving the devil a foothold by holding onto anger against The Church / The Mother has been a predominating feature !
If the explanation in the above sighted article of how the term ’ till ’ does not have same meaning in Hebrew is unsatisfactory , another positive theological meaning for this verse (about St.Joseph not ‘knowing’ Bl.Mother till the birth of Lord Jesus ) would be how the event helped him to know at a greater level that she IS The Mother of the Promised Messiah !
There were the visits of the angels… the shepherds… the Magi …the presentation in the temple when Simeon prophesied that He would be a light even to the gentiles …and ’ the parents were amazed ! ’
( Since this event is in St.Luke’s gospel , traditionally known to be given to him by our bl.Mother herself, some have wondered if those sentiments of amazement were mostly on part of St.Joseph and our Bl.Mother , as a good wife owned up to this human side of St.Joseph too , even if she would have known more ! )
And would their hearts not have been filled with adoration and gratitude - those attitudes of the heart that we in The Church are given abundantly at every Holy Mass …and that have brought forth many with hearts and lives of total dedication without sentiments of deprivation …again unfathomable to our fallen away brethren …esp. in a culture where sex can be an idol !
O Mary concieved without sin, pray for us !