What is there to think? Guru Sahib jee's Hukam takes precedence over all other duties, orders and norms. A serious seeker of Vaheguru will definitely obey the Hukam of Guru Sahib jee, of keeping Bibek. A Gursikh aspiring to keep Bibek and other Rehits will, with love, empathy, care and affection, humbly explain to the mother that it's best for everyone to obey the Hukam of Guru Sahib jee. Going against the Hukam of Guru Sahib will bring no happiness and will result in spiritual downturn and other possible losses in life.
In doing all this, there will be moments when mom will be agitated and angry but at no point a Gursikh should lose anger and answer to mom in manmukhi way i.e. in anger and rudeness but should remain humble and meek. Above all do Ardaas, Paath and Simran supplicating Vaheguru jee for help and divine intervention. Guru Sahib will surely help.
It's sad that when such question is posed to even senior Gursikhs and in some cases even to Punj Pyare, they advise the gullible seekers to wait to keep Rehit. The result is in front of us. Sarbloh Bibek Rehit has almost vanished from the Panth. This has occurred because our senior Gursikhs who themselves were weak in Rehit have been advising new seekers to go ahead and compromise on Rehit.
Little do we realize that no one has any right to give or advise leniency to anyone in the cases of obeying Hukams of Guru Sahib. Even the Punj Pyare only can disclose and inform the new candidates about the complete Rehit of Siri Guru Dasmesh jee but they can't change or alter or dilute the Rehit and Hukams of Guru Sahib jee.
Kulbir Singh