The smell is caused by the fact that the water in the trap has dried out. All you need to do is pour some water down the drain periodically to prime the trap. Simply do this every time you smell sour gas. Alternately, you can pour some mineral oil down the drain (perhaps a pint or so) and leave it alone. This will keep it permanently sealed as long as you don't use flush it out with more water.
Stop over watering them, water should not be allowed to accumilate in the saucer
stop eating Mexican food
Clean it
The cast of OP Stop Smelling Your Socks - 2010 includes: Nawazuddin Siddiqui
i will stop pigs smelling by put into there nose a handkerchiefano ang silbi ng gamot kung wala ka namang sakit
Take a shower!
Take away its nose.
becausethey stop you from smelling.
wash yourself...
You can politely excuse yourself from the situation, step away to a different area, or kindly ask your dad to be mindful of where he passes gas. Setting boundaries and communicating your discomfort respectfully can help avoid the situation.
if you have water to the rest of the house and its the toilets only then either someone has turned off the valves under the toilets or the fill valves have both failed at the same time. [not very likely!!] cant be much of anything else.
Give it a bath - using cat shampoo.