My paternal grandparents (above) probably spoke three languages apiece. Grandma Henrietta Mahler Burk (1881-1954) was born in Latvia, and surely spoke Latvian as well as English and, I'm guessing, Yiddish. Possibly she spoke Russian too, although I don't know for sure.
Her husband, Isaac Burk (1882-1943) was born in Lithuania, and spoke that language plus Russian and maybe even Yiddish in addition. Isaac certainly picked up some English when he stopped in Manchester, England, to stay with family in 1901, en route from Lithuania to North America.
maternal grandparents also spoke multiple languages. Grandpa Theodore Schwartz (1887-1965), shown above escorting my mother down the aisle at her wedding, had a way with languages. His native Hungarian tripped off his tongue, but he could also speak several other languages, including English--which is why the steamship lines employed him in NYC as a runner around Ellis Island in the 1910s.
His wife, Hermina Farkas Schwartz (1886-1964), was fluent in Hungarian, having been born there, and learned Yiddish in the Lower East Side of NYC as an immigrant. Also she learned English in NYC night school.
In my husband's Wood family tree, there are three adult Mayflower ancestors (Degory Priest, Isaac Allerton, Mary Norris Allerton). Therefore, in addition to English, they may have learned some Dutch when the Pilgrims fled to the Netherlands prior to sailing to the New World. Once in Plymouth, perhaps they learned a few words to talk with Native American tribes? Photo above shows my late father-in-law (Edgar James Wood, 1903-1986) at left with two of his Wood brothers.
Also in my husband's McClure line, his ancestor Halbert McClure (1684-1754) was born in County Donegal, and sailed to Philadelphia with his family in the 1740s. Because the McClures were originally from Isle of Skye, hubby's ancestor may have spoken Scottish Gaelic or Gaelic (or both). On arrival in the American colonies, however, the McClures would most likely have learned English, because they walked from Philadelphia to Virginia. They would probably need to speak English to buy provisions along the way. Once in Virginia, they bought land--again, a transaction that probably required English.