Had a few GRONI credits so check Patrick's birth certificate-
11 Dec.1917, Infirmary coleraine, Patrick McKeever of Shanlongford, male, bachelor, 9 months, orphan, general tuberculosis exhaustion certificate, registered by J. McLarnon, Workhouse 7 Jan.1918.
His birth certificate (not yet available online) would show parents (or at least mother) but I think that he was Lizzie's child. He was born around March 1917, she died of TB in August and he (an orphan) died of TB in December.