Below is part of a Walking Map from the City of Somerville, Massachusetts.

The McNeill family arrived in the United States in 1926 and their first home was on Clarendon Avenue.

By 1929 they had moved closer to Davis Square and were living on Jay Street.

Leonard's parents' home until at least 1946 was on Highland Avenue and
they would have moved there by 1933.

Sources of this information are the Somerville City Directories and
the US Census Ancestry.com

Tufts University is North of the McNeill's homes, Harvard University is about two miles South,
and MIT a bit further to the South East.

Central Square, one of the places Leonard worked, is not on this map but does show up
in the PDF version