a recent faucet replacement has mom going NUTS
The problem is that you either have an obstruction in the water lines, a partially opened shutoff valve, or a faulty shutoff valve.
Since it is quite possible that your bro-in-law may have forced some debris into the supply lines while changing the faucet, first try flushing the fasucet by inscrewing the aerator at the tip then running water for a few minutes without it. This could remove trapped debris. Then reinstall the aerator.
If you still have the problem, make sure the shut off valves are all the way open.
If they are, then turn house water off and remove the valve stems to shutoff valves to inspect or replace washers if necessary.
Hot water pressure very low in one faucet in my house
Installing a bar faucet in a kitchen sink?
old bathroom faucet
Replacing a shower faucet
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