Hi! First, I'm really sorry for your loses. Next, there are several ways to say so in Spanish. You can say, for instance:
No olvides nunca -
Nunca olvides -
Jamás olvides - (these are all different ways to say "never forget")
No olvides jamás-
Maybe, someone can suggest other ideas. Hope it helps! (I particulary like "Jamás olvides", but it's just an opinion)
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