By the sounds of it a Financial Planner would be really useful for your parents. A good fee for service one will be able to help them make the sort of decisions you're talking about, but also look at options like putting their super (or any other lump sums) into an allocated pension so that they get a regular income stream vs keeping them as a lump sum, what government benefits they can access, how they can make the most of the any lump sums etc.

It's also very useful in preparing for retirement, particularly if they're over 55, there are options available to them through super/transition to retirement pensions where they salary sacrifice their income into super and reduce their income tax significantly. They then access the super they already have in the form of an allocated pension and use that as an income. It can be a bit complicated to explain, but the tax savings can be huge and let them save that little bit extra in the last year or two.

When looking for a financial planner, I think it's really important to go to a fee for service planner who doesn't accept commissions. Many planner operate on a commissions basis, so don't charge you anything, but make their money by getting paid a commission for placing their clients money in certain products. With a fee for service planner you can be sure that the advice they give is based on what is in your best interests, rather than who is going to pay them the biggest commission. The industry super funds have a fee for service financial planning company which they refer members to, the first appt is free. If you google Industry Fund Services you will be able to find their website.

HTH