I do not have much information on this family but here is everything I have.I believe the first o in Ylonen has and Umlaut like character over it.
John YLONEN and Maria EYSON both were born in Finland and as best I can tell most likely stayed there until their deaths.
The only child I know is:
Born: September 1874 in Finland Died: October 26, 1906 in Lanesville, Essex Co, Massachusetts
Married in Finland abt 1892 to Johan PUUKKO (in America the name was changed to John or Johan PELTO)Born: 1871, Died after 1920 in MA(probably the same as Emma. He remarried Margaret Sofia Aho in 1907.
They immigrated to Massachusetts 1903.
Their children together are: Arvi J Pelto Uno W Pelto William Pelto Toivo Pelto (my grandfather).
I believe they left Finland via Rauma, Turku and Pori Province,Finland
If anyone knows anything else about the Ylonen family please post it here or email me at firstname.lastname@example.org