Drainage holes in basement?

Let me start off by saying that I live in an old house Built-in 1922. i have 2 drainage holes 2 feet from each other l (in basement). 1 is covered (loose lid) the other has a small cover like the one in a shower with small holes in it. Suddenly its been overflowing with sewage ONLY when i was clothes. It never... show more Let me start off by saying that I live in an old house Built-in 1922. i have 2 drainage holes 2 feet from each other l (in basement). 1 is covered (loose lid) the other has a small cover like the one in a shower with small holes in it. Suddenly its been overflowing with sewage ONLY when i was clothes. It never happens when we shower or even bath & theirs 6 of us. We are not on a septic tank either. Why would this be happening? Can i seal them with cement? Can i cover them with drainage covers? but how would i cover the drain with holes? Please help!
Mother of 4
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