no...there is no kher-heb or a priest that supervises the embalming and funeral arrangements. when a person passes...his or her abusua (family) is responsible for the funeral arrangements. when used in this sense abusua, or family, does not apply to the persons wife/husband or children. instead, the abusua applies to the person's sisters/brothers/cousins/nephews....etc. cousins are simply referred to as brothers and sisters. i do not think there is a word for cousin in the language.
when a person passes, his/her abusua convenes and selects a committee to see to the funeral arrangements, which includes financing the funeral. the committee is led by the head of the family (or the abusua panyin). the embalming is done by a specialist or a professional who is hired by the committee.
there are certain cloths / patterns that have specific names and colors and therefore have different meanings. the colors of black and red in the traditional garment primarily represent death or mourning. various family members (including relatives) can choose to wear a certain pattern to identify their relationship to the person. for instance, all of the person's children / grandchildren -- with the approval of the committee -- may choose to wear the same pattern/colors.