A guardian ad litem investigates and reports on the child's best interests (§§ 61.401–61.405) with defined powers and immunity; they are the court's eyes, not either parent's advocate.
Social investigations (§ 61.20) and parenting-plan recommendations bring professional evaluation into contested parenting cases.
Parenting coordination (§ 61.125, Rule 12.742) helps implement plans in high-conflict cases — with consent and safety limits built into the rule.