The Rebbe joyfully congratulates the recipient on his daughter’s engagement and blesses the couple to build a home based on Torah and mitzvos. He also acknowledges the good news of his grandson’s third birthday and encloses a letter from the Previous Rebbe on the custom of upshernish. He concludes with blessings for continued good news and success.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/shevat/897