Literal translation :
We send you all our family and son-in-law as a keepsake. As an everlasting and lasting remembrance.
Family Marciniak and brother-in-law Białecki.
Map: location of Święcianowo :
Can't thank you enough for translating this message. I thought it ID all the people in the photo, but not so.
Another mystery to solve!
Happy Thanksgiving to you & yours.
Thank you, likewise to you and your loved ones.