Deborough Line (Allen) - Why maintain a duplicate MP?

Actually there had been a bad merge and generation confusion.

Now we have attached sources to indicate:

(Immigrant) Col. William Line
Gender: Male
Birth: April 18, 1662
Church Brampton, Northamptonshire, England (United Kingdom)
Death: November 16, 1726 (64)
will found in Burlington Co. New Jersey
Immediate Family:
Husband of Elizabeth (Tingley) Line
Father of William Line, Jr. and Mary Line
——

William Line, Jr.
Gender: Male
Birth: 1690
Elizabeth, Union, NJ, United States
Death: after March 08, 1745
Elizabeth, Essex County , New Jersey, United States
Immediate Family:
Son of Col. William Line and Elizabeth (Tingley) Line
Husband of Elizabeth (Unknown) Line
Father of William Line; Joseph Line; John Line; Mary Line; Rebeckah Line and 2 others

(will attached, his wife
Elizabeth Line Was probably not a Thomas Tingley of Attleboro MA).

——
William Line, Ill MP
Gender: Male
Birth: 1717
Province of East Jersey
Death: March 10, 1779 (61-62)
Blue Brook, Essex, New Jersey, United States
Place of Burial: Baptist Churchyard, Scotch Plains, New Jersey
Immediate Family:
Son of William Line, Jr. and Elizabeth (Unknown) Line
Husband of Deborough (Allen) Line
Father of Fernita 'Nety' (Line) Elston; Phoebe (Line) Elston; Joseph Line; Clarissa (Line) Shotwell; Cleo Line and 5 others