Hi your kitchen is beautiful! I see you have some red pieces in your kitchen and I have seen a home where the ceiling was red a nice warm red and it made the home feel so nice and cozy like you never wanted to leave. They too had a ceiling like yours but that may be too bold. I just looked at ideas in houzz for red in the kitchen...wow how fun. You mentioned you have some red and yellow in your furniture etc., maybe red is for you. Good luck !

To start with, don't try to do the whole house at once, you will only confuse yourself more. Remember Rome wasn't built in a day. Plan room at a time, look for available options in your price range and then ensure everything comes together through the whole house. A colour scheme can achieve this and introducing blues and greens will keep the look fresh and modern but still masculine. Maybe introduce dad to Houzz too so he can give you ideas of what he would really like. Agree with Louie some simple sheer white curtains would soften the blinds and dress up the rooms better. I don't see anything wrong with keeping the guest room beds if they are comfortable but new, more modern linen would make a huge difference. I think I would have to lose the dressing table in the master bedroom though, but to keep the bed and add new bedside tables and drawers would not be out of place. I would definitely look for new artwork though, unless your dad has any sentimental reason for keeping any he has. Check out $2 shops, many of them have inexpensive canvas prints these days that can be used very effectively. It comes down to how creative you can be. Check out Houzz for interesting ways to hang artwork too. $2 shops are also good for finding interesting pieces to create a coastal look especially when it is all very "in" at the moment. If the lounge is still good and comfortable, don't rush to replace it. It is a little bulky for the room but keep everything else to a minimum. The glass coffee table for example, is a good idea as it visually does not take up space. The most important thing for older people is to have furniture that is not too difficult to move for cleaning and to keep beds and chairs at a realistic height for ease of sitting and standing as joints get older. Good luck with it all.

Kill two birds with one stone and replace the balustrade with a full length, double sided cabinet. This will blur the height difference between the rooms while creating more if a sense of the two rooms working independently of each other, and provide a place for interesting piece or two on the top(like sculpture). In the process, you could ensure the traffic flow and furniture of the rooms works best with the passage to the lounge where it is, and if not, decide where it works best and build the cabinet either side of the passage.

The Bally girl has a fun aspect to it and generates energy. I feel it has a good balance of red and black to compliment the white background.