List of 15 ancestors found in 40 iterations (15 distinct persons and 15 positions into tree)

Generation 0 - 1 person(s) on 1 (1 distinct persons)
Generation 1 - 2 person(s) on 2 (2 distinct persons)
Generation 2 - 4 person(s) on 4 (4 distinct persons)
Generation 3 - 4 person(s) on 8 (4 distinct persons)
Generation 4 - 4 person(s) on 16 (4 distinct persons)
16Joos Roosen (~1520-~1578)
17Lysbette Galmaerts (~1543-)
18Christoffel Van Hollandt (~1543-)
19Margariete Vierendeel (~1545-)