I want to find shareholder relationships between companies.
in the below example ‘Person 1’ have directly 50% of ‘Company 1’ shares then need to check if ‘Company 1’ also have share’s of other companies. ‘Company 1’ have 50% of ‘Company 2’ share and 20% of ‘Company 3’. it means ‘Person 1’ indirectly have some share in ‘Company 2’ and ‘Company 3’.

The desired output in this example is:

Company 1 : Person 1 , 0.5

Company 2 : Company 1 , 0.5

Company 3 : Company 2 , 0.2

This is my code:

companies = {
    'Company 1': {
        'Person 1': 0.5,
        'Person 2': 0.3,
        'Person 3': 0.2,
    },
    'Company 2': {
        'Person 4': 0.25,
        'Company 1': 0.5,
        'Person 5': 0.25,
    },
    'Company 3': {
        'Person 5': 0.6,
        'Person 6': 0.2,
        'Company 2': 0.2,
    },
}

def is_shareholder_in_company(company, companies, shareholder_name):
    company_shareholders = companies[company]

    for shareholder, ownership_percentage in company_shareholders.items():
        if shareholder_name == shareholder:
            print(company, ':',shareholder, ',', ownership_percentage)
            return True

for i in companies:
    if is_shareholder_in_company(i, companies, 'Person 1'):
        temp_name = i
        for j in companies:
            if is_shareholder_in_company(j, companies, i):
                temp_name = j
                for x in companies:
                    if is_shareholder_in_company(x, companies, j):
                        temp_name = x

how to refactor nested if’s? the count of nested if’s is dependent on ‘companies’ data and it is unknown.
thanks.