Mrs McGrath, who was originally from Artane, died early yesterday in the Bon Secours Hospital in Glasnevin after a long illness.
In her early 50s, she was a teacher in Darndale for many years and was active in teachers' union, the INTO.
The couple met in St Patrick's teacher training college and had two daughters, Caoimhe and Cliodhna.
Mrs McGrath's removal to the Church of St Vincent de Paul in Marino took place today and her funeral will be held after 11.15am Mass on Monday.
Mrs McGrath, nee Russell, is also survived by her sister Claire, brothers John and Kieran, as well as brothers-in-law, sisters-in-law, nieces, nephews, relatives and a wide circle of close friends.
Deputy McGrath was elected to the Dail for the first time in 2002 and was re-elected in 2007.
He had been supporting the Coalition Government up to October last year when he announced they could no longer count on his vote.
In a statement at the time, he said: "As someone who comes from the tradition of Tone and Connolly, I have to act in the interests of the elderly, the sick and disabled and the future of our children.
"I have also supported the call for more patriotism. However, my patriotism does not include hammering the elderly, the sick, the disabled and young children is large class sizes. There are always other creative ways to fund these matters.
"I have no other option but to withdraw my support for the Government."