The question is not whether a family member is capable. The question is where the risk of the job should sit: with you, with a hired crew, or with Dad, who may insist on doing it himself. Dad has a real stake in keeping his own work, and he deserves to hear why the job is being moved. Frame the gutters as a job for the house, not as a sign that he is failing.
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Measure the job before you decide
Count the stories. Note how steep the roof is above the lowest gutter run, how high the eaves sit off the ground, and whether any overhead lines run near the walk where the ladder would stand. Check whether the gutters have guards, since guards change the work. Look at the downspouts and note whether any are already blocked. Write these facts down. Height and nearby lines decide most of this question.
What the do-it-yourself route requires
Decide who holds the ladder, where it will be placed on level ground, what footwear will be worn, and whether the work will be done from the ladder or from a stable platform. A second adult who is present and not doing anything else is part of the job. If nobody can hold the ladder, the job has moved to the hiring column.
What the hired route should include
Ask each company what is included: removing the debris, flushing the downspouts, hauling the debris away, checking hangers and seams, and clearing the area below. Ask whether they will run water through each downspout and show you that it drains. Ask whether they will photograph the gutters before and after. Ask for a certificate of liability insurance and proof of workers' compensation coverage before they start. Ask whether the people who arrive are the company's own crew or subcontractors.
Compare two bids on the same scope
When you compare two bids, make sure both cover the same debris removal, downspout flush, and hanger check. A cheaper bid that stops at the gutter line and leaves the debris on the ground is not the same job. Write the scope into the message you send to each company, so the bids can be compared as one job.
What Dad will say, and how to answer
He may say he has always done it himself. Agree that he has, and ask him to walk you through how he does it, so you know the steps. If he wants to stay involved, offer him the job of running the hose from the ground while someone else handles the ladder. Keep the decision anchored to the house's needs. If the work is changing, the reason is the height and the access, not his ability.
The next move
Measure the height of the lowest gutter run and check the overhead lines before anyone plans the job. Then request two written scopes from two companies using the same list: debris removal, downspout flush, hanger check, and photos before and after. If the family decides to do it themselves, the next move is to put a second adult on the ladder before the first step is taken.