My father is having spinal tumors and kidney...

is your dad medical condition dangerous ?
yes it is , as tumors in spinal area are usually secondary to another area primary cancer like lung cancer or prostate cancer 
- along with that , stage 3 kindey failure isnt reversible , its can be managed , but cant be easily treated 
what are the medical options for kidney failure :
1. diuretics
2. Blood pressure control medications that support kidney work, such as: ACE inhibitors
3. Kidney stents
4. Dialysis
5. The last option is kidney transplant
what are the options for tumors :
- surgical options can be suggested