My name is on trust checking account. When family member passes, can i still write checks on that account or do I have to change it?

A trust passes from "revocable" to "irrevocable" upon the death of the primary trustor. The bank will hold the trust until you apply for an EIN if you are trustee after death as well as now. Then with your new EIN (for taxes) the bank will put the Trust under your control as Trustee of the Estate, if the trust has designated that you are the successor Trustee. I recommend if you are dealing with a trust of any size you see a Trust and Estate Attorney. While I only needed one and one half hours of help, and paid under 1,000 for it, it was invaluable. The attorney can get the EIN online through the IRS. If you try on your own and make a mistake (I did) it sets you back hours of frustration. Good luck.