Gender of babies

There are six children in the primary family - two boys, 4 girls. The two boys each had only male children ( they each had two sons) of the four girls, three had children and all of these children were girls - One had one girl and two had two girls.
In the next generation one boy had two sons, one boy had one son, one girl had two daughters. In other words, in the past two generations the boys had boys and the girls are had girls. this had happened 14 Times in a row. what is the probability of this happening.