Hello Scott
Had a quick look on Family Search and results below, hope these are of use.. If you try the search page for Margaret Hill date range 1745 - 1755 you will see that she may have had a sister Anne Henderson born 1770... and Margaret 1771...Margaret and James married in 1768.
https://familysearch.org/searchName James Henderson
Spouse's Name Margaret Hill
Event Date 14 Jun 1768
Event Place Dundee,Angus,Scotland
Indexing Project (Batch) Number M11282-2
System Origin Scotland-ODM
GS Film number 993400
Name Elisabeth Henderson
Gender Female
Christening Date 17 Feb 1773
Christening Place DUNDEE,ANGUS,SCOTLAND
Birth Date 12 Feb 1773
Father's Name James Henderson
Mother's Name Margaret Hill
Indexing Project (Batch) Number C11282-5
System Origin Scotland-ODM
GS Film number 993423
Name John Wright
Spouse's Name Elizabeth Henderson
Event Date 15 Jun 1796
Event Place Dundee,Angus,Scotland
Scotland Marriages, 1561-1910
Indexing Project (Batch) Number M11282-4
System Origin Scotland-ODM
GS Film number 993401
Name John Wright
Gender Male
Christening Date 30 Jun 1799
Christening Place DUNDEE,ANGUS,SCOTLAND
Birth Date 26 Jun 1799
Father's Name John Wright
Mother's Name Elisabeth Henderson
Indexing Project (Batch) Number C11282-6
System Origin Scotland-ODM
GS Film number 993424
Name James Wright
Gender Male
Christening Date 17 Oct 1801
Christening Place DUNDEE,ANGUS,SCOTLAND
Birth Date 15 Oct 1801
Father's Name John Wright
Mother's Name Elisabeth Henderson
Indexing Project (Batch) Number C11282-6
System Origin Scotland-ODM
GS Film number 993424
Name Robert Wright
Gender Male
Christening Date 05 Jan 1797
Christening Place DUNDEE,ANGUS,SCOTLAND
Birth Date 29 Dec 1796
Father's Name John Wright
Mother's Name Elisabeth Henderson
Indexing Project (Batch) Number C11282-6
System Origin Scotland-ODM
GS Film number 993424
Name Clementina Wright
Gender Female
Christening Date 12 Dec 1802
Christening Place DUNDEE,ANGUS,SCOTLAND
Birth Date 07 Dec 1802
Father's Name John Wright
Mother's Name Elizabeth Henderson
Indexing Project (Batch) Number C11282-6
System Origin Scotland-ODM
GS Film number 993424
All the best for now,
Regards
Mark