/the heirs and estate executors (in case they have been mentioned in the will alongside with the public accountant الخبير الحسابي).
or :
/the heirs and administrators of the same estate
/the heirs and executors of the same estate

However the text provided refers firstly to : وصي (معين/مكتوب) بالوصية (الخبير الحسابي/ علي عبد الله سلطان المرزوقي) = estate executor who has been removed by the judge and secondly to اوصياء معينون من قبل المحكمة (حامد ومريم ولادن)= (estate) administrators appointed by the court.

Note : There is no mention of guardians in your text.
وصي على الاطفال القصر = guardians
وصي على التركة = estate executor (= trustee) / and estate administrator

Executor vs administrator
An executor is named in a will, and an administrator is appointed by the probate court when there is no will (the deceased died "intestate"), or the named executor is unable to serve for any reason.
https://www.policygenius.com/wills/executor-vs-administrator...

The estate administrator can be the heir (also beneficiary):
An estate administrator is the appointed legal representative of the deceased. The legal representative may be a surviving spouse, other family member,
https://www.irs.gov/individuals/responsibilities-of-an-estat...


The Difference Between a Trustee, Guardian and Executor
https://www.cnb.com/personal-banking/insights/trustee-guardi...