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My alphametic NOWAY*TOWIN=<PRODUCT> exists in two versions (both with a unique solution):
a. Both words for a "PRODUCT" contain the letter D, one in the begining, the other at the word's end.
b. One has 9 letters the other 10, not all of them distinct.
A family gathering included one grandfather, one grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one father-in-law, one mother-in-law and one daughter-in-law.
What can be the minimum number of people present in the gathering?
Latest: 
Bonus: 
