The Scottish Parliament are due to vote for the final time on the Scottish Equal Marriage Bill later today.
In November last year MSPs backed the bill at it's first stage with 98 votes to 15, with 5 abstentions.
Some religious groups are opposed, but ministers said it was the right thing to do.
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The family of Christian Pay, who died on Friday after suspected substance abuse at a festival, have paid tribute to the Millom teenager.
The Borders Railway is to be officially opened by the Queen... on the day she becomes Britain's longest serving monarch.
Christian Pay's family say he was "loved by all" and had "the heart of a lion". The 18-year-old died after falling ill at the festival.