init -1000 python:

    original_say = renpy.say

    def capitalize_first(text):
        if not text:
            return ""
        return text[0].upper() + text[1:]

    def custom_replace(text):

        text = text.replace("Housemate", "Brother")
        text = text.replace("housemate", "brother")
        text = text.replace("Housmate", "Brother")
        text = text.replace("housmate", "brother")
        text = text.replace("Roommate", "Brother")
        text = text.replace("roommate", "brother")
        text = text.replace("My friend's son", "My son")
        text = text.replace("my friend's son", "my son")

        mother_replacements = [
            ('. [mother]', '. ' + capitalize_first(store.mother)),
            ('! [mother]', '! ' + capitalize_first(store.mother)),
            ('? [mother]', '? ' + capitalize_first(store.mother)),
            ('[mother]', store.mother)
        ]
        
        sister_replacements = [
            ('. [sister]', '. ' + capitalize_first(store.sister)),
            ('! [sister]', '! ' + capitalize_first(store.sister)),
            ('? [sister]', '? ' + capitalize_first(store.sister)),
            ('[sister]', store.sister)
        ]

        for old, new in mother_replacements:
            text = text.replace(old, new)

        for old, new in sister_replacements:
            text = text.replace(old, new)

        # Capitalizing at the start of a string
        if text.startswith(store.mother):
            text = capitalize_first(text)

        if text.startswith(store.sister):
            text = capitalize_first(text)

        return text

    def new_say(who, what, *args, **kwargs):
        what = custom_replace(what)
        original_say(who, what, *args, **kwargs)

    renpy.say = new_say