If you mean denying a visa to the spouse of someone who's in the United States, say so. "Separate families" in this context is very obviously an attempt to imply he's doing something much darker which he isn't doing. Biden actually started the task force to find and reunite those separated families, although the policy itself had already been abandoned, being too evil to continue for all that long under even the Trump administration.
As with a lot of these stories, I am interested to know why someone who is supposedly deeply concerned with the plight of migrant families is specifically attacking one of the parts of the US government equation that is trying to do something good for them, and instead creating (with quite a bit of success) a whole Goebbels-style reality where he's doing the exact opposite, partly by blaming him and specifically him for anything any part of the fairly racist and unreasonable US immigration apparatus ever does even down to the individual level, and ignoring the question of what the Biden administration itself is doing to shape policy, to the benefit of the team that actually is thirsting and sharpening their knives for what terribly overly malicious things they might get to do to migrants as an affirmative goal of theirs (and not a minor one) under a second Trump administration.