AIBU to ask for reasons to want PR for my step-children?

[HowLuckyAmI]

For 2 years now my Dh's 3 children have lived with us both.
They came to live with us as their Mother has alcohol/drug issues and was not looking after the children.
I welcomed them and have done everything with in my power to keep them safe and give them the family life they deserve along with DH.
They are good kids and i have a brilliant relationship with all of them,
they do not see their mum but we speak about her positively.
My Dh has full custody of the children, i do everything their mother should be doing. I am a stay at home parent with my own DC so i take all Dhs children to school/pick ups. Dentist appointments, liaise with school but that is as far as it goes with me being allowed to take them to appointments etc. Dh and i share the responsibilities of looking after all of our DC but after a discussion with DH this weekend he asked me to apply for parental responsibility. I have read up on it and seems like the sensible thing to do. After all if anything happened to Dh social services have said they would prefer the children to stay with me as due to safeguarding issues they will never be allowed back to live with their mother. My question is after reading the application i have to state the reasons as to why i want PR. apart from what i have stated before is there anything else i should write to support my self in my application?

So you could authorize medical treatment eg at A&E? They might not have time to locate your h first.

Long term stability and making the care you carry out for them official, so you are able to make emergency choices and not have to defect to their father when time is of the essence?

Because from a legal future perspective, it will also reassure the DC you are in it for the long haul, won't let them down, and in the very worst case scenario of something happening to your DH, they wouldn't be stuck in the care system/split up due to having no legal guardian.
They have already lost their mother to addiction, it would be terrible to lose you to poor safeguarding of your family's future.

Is their mother still around? I have PR for my step daughter and there was no firm to fill out with reasons. My DH, my SD's mum and I just popped into the county court one lunch time and had the form witnessed by a clerk as we signed it. Could be an easier option for you?

Medical things are a very legitimate answer to put in there. I have my stepson full time too and although mum is involved now at one point she wasn’t at all and I thought Jesus if this child needed an op now a virtual stranger can authorise this over me, the one who raised him!!