The older baby looks like a blue tort. Hard to tell with this lighting; might also be lilac tort but lilac is much less common in holland lops. The younger baby is still a bit young to tell. It's definitely dilute and definitely tan pattern. Right now I would lean towards blue tort otter. Could also end up being a blue otter, lilac otter, lilac tort otter, maybe even something like a blue point marten or a blue silver marten. The adult with the white ear is broken black tort. The other adult is dilute and looks either tan pattern or agouti as well. A better picture of the colored section of his fur (especially if we can see undercolor) might help. From this picture he could be anything from a broken cream to a broken opal to a broken blue tort otter.
Hmm, it is hard to tell based solely on pictures and limited info on genetic background. The lighting also plays a big part in identifying coloring, so here are my best guesses (in order of pictures provided):