Second named of twins, so maybe the youngest.
As he names two sons Robert, it would indicate his father was Robert?
The marriage entry reads they were booked to marry 27 Nov 1773 and married 17 December 1773. Both were from Govan parish.
Sources
Scotland's People Baptism, marriage and baptisms of his children
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: