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Baby Liam (Blake and Brennan Johnson) is obviously of mixed parentage -- born from the same mother, but with an unknown father -- a fact that was glossed over in the show's premiere. Shameless is biggest drama premiere in seven years.
Shameless fans wondering about where the youngest Gallagher child came from will soon get an explanation. In the Showtime series, drunken patriarch Frank (William H. Macy) is so unreliable, his oldest daughter Fiona (Emmy Rossum) has to manage the hectic household and her five siblings.