Upvote:4
There might not be clear records of it:
Mary Anne Trump's billionaire son Donald visited the house in which his mother grew up, and his cousins in 2008.
On that trip, the now president-elect said he had been to Lewis once before as "a three or four-year-old" but could remember little about it.
—BBC, Donald Trump's mother: From a Scottish island to New York's elite
Given Donald Trump was born in June 14, 1946, this would mean it was around 1949-50.
I tried for more specific searches around this time period, but looking into Trump and these years links people to the Hebrides Revival which seems to overshadow any possible remaining mentions of the visit.