Both need similar conditions. High light, warmth, good drainage, underpotting.

So all you can do in these circumstances is to improve their growing conditions, repot into a smaller pot and hope but that is a bit difficult in the middle of winter. Do you have them under lights?

browning from the base up is a sign of fusarium fungus. There is no cure for it. It attacks the cappillary action that brings water into the plant.

You need to cut out the infected areas and try to save any section not yet attacked.

It spreads fast and unless the plant is important I usually destroy my infected plants.

It is highly contagious and clean your tools and your hands often.

Brooke its two plants! Mind your own business! I asked people for help with my orchids not for criticism of the decisions that were made. You donÂt know the history. ItÂs not like I have a whole greenhouse she agreed to take care of. You have no idea what the agreements were and therefore should not be judging any of the decisions that were made by this party. I appreciate that you are giving me culture advice about my orchids, but honestly your snarky remark is much uncalled for. And one more thing, what is it called when someone does not tell you the truth? I think that you can answer that one all by yourself. Be a little more respectful of other people and the decisions that they make. Like I said before I asked for help with my orchids and not for a criticism of actions and choices.
Thank you

HAPPY NEW YEAR!

Amen.

I'm not going to touch this one with a ten foot pole.

When I was stationed overseas for several years my mom took care of my dozen or so orchids. Most of them survived and even bloomed. The trick was that they were all mounted. Mounted orchids are a lot less susceptible to overwatering than potted orchids...and it's a lot easier to revive an underwatered orchid than it is to revive a rotted orchid.

However, my orchids were outside and it's certainly easier to water mounted orchids outside. It's not that difficult to water mounted orchids inside the house but if you want to stick with the pot option then my recommendation would be to increase the size and perhaps the type of the media. Might try 1" gravel or larger. That way if your mom is just watering her house plants on a predefined schedule you adapt the media to her watering habits rather than the other way around.