Not in family tree, it is difficult finding people after 1911, but with the help of the Census and the place Killen there are Thompson's in the british telephone book in Tyrone, put in surname, up will come place names, click on Killen Castlederg. There are 13 listings, its a lot but might be worth a few letters with the information you have to locate family still in the area.
Listings with full addresses and postal codes.www.familysearch.org
no luck here with Lena or William's birth with a year each side but ages were often wrong on census but not usually with little ones. I see she is married not widowed so husband might of been away.
#2 Stragolan, Clonelly, Fermanagh
Isabella 30 married embroiderer ( again no husband's name)
Caroline 13 embroiderer