List of 5 ancestors found in 40 iterations (5 distinct persons and 5 positions into tree)

Generation 0 - 1 person(s) on 1 (1 distinct persons)
1Mahaut de Lalaing (~1160-)
Generation 1 - 2 person(s) on 2 (2 distinct persons)
2Gérard II de Forest (1137-1187)
3Adèlaïde de Râches (1139-)
Generation 2 - 2 person(s) on 4 (2 distinct persons)
4Gérard Ier de Forest et de Lalaing (1109-)
5Jeanne van Halewijn (1121-1172)