CAT reporting via IT38

Hi there,
My family has inherited a house recently. In the Will the house is split across 5 of us (2 adults 3 kids).
I am trying to complete the IT38 forms for CAT - what value should I use for "Market Value of Property" ? Should I use the total market value, or should I use my share (%) of the total market value? There doesnt seem to be anywhere to enter my share ... so not totally sure how to do this.

Also, I will be taking care of the CAT forms for the other four people in my family. Is it possible for me to file on behalf of each of them (listing their PPSNs as beneficiaries) separately through MyAccount on revenue.ie? (i.e. when I submit the first one, I will still have an option to submit the others)? Might be a stupid question, but I want to make sure that once I submit the first one I am not locked out from submitting the others.

Thanks !

You enter 1/5th of the value - that is your share

Not sure that you can enter the other IT38s unless they set you as an agent for them

Of course, if you have their password ....

Thanks for the advice - yeah i am not sure about doing all the IT38s - but when I go into MyAccount to do it , I can enter anyone as the Beneficiary and just put in their PPSN , no need for passwords etc, so I am hoping I can do it.