If the ruler of the fourth house is in the sixth house, this means that your parents (or one of them) are likely to be hard-working people, very much focused on providing some service to the world.
This sometimes shows that your parents are doctors, or work in a medical field. Other likely fields could be health and diet.
Since you come from the same background, you, too, may be interested or engaged in these pursuits. Also, this placement means that your parents and you will be engaged in the occupation that is useful, where you can provide much service to the world.
Not only your parents, but your past generations may have been hard workers with useful engagements, helping the world in some way.
You are likely to love animals, and may keep them, care for them, and may even work with them. This especially applies to small animals, like dogs, cats, goats, and so forth.
Your family, as well as you, may be detail-oriented and very observative; yet if the mentioned combination is afflicted, you may be very picky and critical. You want to see things done perfectly, especially at work, but few people can meet your high standards.
You are likely to want to keep your home orderly and clean. Disorderly conditions can make you feel uneasy. And your parents are likely to have been the same.
If you are in a health field, this placement shows that with age, you may gain in wealth and power. However, if you are in other fields, this placement is not so good, and you are advised to look after your health, especially as you age, so that there are no chronic illnesses later.
Also, if you are not in a health field (such as a medical field, being a sports coach, dietician, and so forth), the inheritance that you may get from your parents, especially as land or property, may be lost. The same applies to the land and property you purchase with your own money, and the same applies to your savings.
Such things may be lost because of sickness (such as you having to sell the property or spend savings to pay for medical bills) or because of trusting the wrong people with the inheritance, especially if those people work under you.
Since you are likely to be very much focused on your physical condition (and your other big focus will be on your work), it’s very important not to dwell on any kind of illness so that it doesn’t manifest. Especially when you are sick, you must dwell on health, on the perfect body, and not on illness. This will help you get better.
Also, you must care for your peace of mind, and spend as much time as possible in pleasant surroundings and good conditions, as this is very beneficial for your health.
If your nerves are tense, your health is not likely to stay good for long, so you will benefit from listening to relaxing music and staying in harmonious surroundings.