Adopt

base = 0
modifier = {
	add = -15
	desc = parents_are_alive_tt
	OR = {
		father ?= {
			is_alive = yes
		}
		mother ?= {
			is_alive = yes
		}
	}
}
modifier = {
	add = 10
	desc = i_hate_my_mother_tt
	exists = mother
	mother = {
		is_alive = yes
	}
	opinion = {
		value <= medium_negative_opinion
		target = mother
	}
}
modifier = {
	add = 10
	desc = i_hate_my_father_tt
	exists = father
	father = {
		is_alive = yes
	}
	opinion = {
		value <= medium_negative_opinion
		target = father
	}
}
modifier = {
	add = -10
	desc = i_like_my_mother_tt
	exists = mother
	mother = {
		is_alive = yes
	}
	opinion = {
		value >= medium_positive_opinion
		target = mother
	}
}
modifier = {
	add = -10
	desc = i_like_my_father_tt
	exists = father
	father = {
		is_alive = yes
	}
	opinion = {
		value >= medium_positive_opinion
		target = father
	}
}
modifier = {
	add = {
		value = 5
		if = {
			limit = {
				opinion = {
					value >= high_positive_opinion
					target = scope:actor
				}
			}
			add = 10
		}
		if = {
			limit = {
				opinion = {
					value >= very_high_positive_opinion
					target = scope:actor
				}
			}
			add = 10
		}
	}
	desc = i_like_you_tt
	opinion = {
		value >= medium_positive_opinion
		target = scope:actor
	}
}
modifier = {
	add = 10
	desc = youre_my_friend_tt
	has_relation_friend = scope:actor
}
modifier = {
	add = 10
	desc = youre_my_guardian_tt
	has_relation_guardian = scope:actor
}
modifier = {
	add = 5
	desc = i_want_a_mother_tt
	scope:actor = {
		is_female = yes
	}
	OR = {
		NOT = {
			exists = mother
		}
		mother = {
			is_alive = no
		}
	}
}
modifier = {
	add = 5
	desc = i_want_a_father_tt
	scope:actor = {
		is_male = yes
	}
	OR = {
		NOT = {
			exists = father
		}
		father = {
			is_alive = no
		}
	}
}
modifier = {
	add = -15
	desc = i_am_noble_tt
	has_no_particular_noble_roots_trigger = no
}
modifier = {
	add = {
		value = 5
		if = {
			limit = {
				number_of_personality_traits_in_common = {
					target = scope:actor
					value = 2
				}
			}
			multiply = 2
		}
		else_if = {
			limit = {
				number_of_personality_traits_in_common = {
					target = scope:actor
					value = 3
				}
			}
			multiply = 3
		}
		else_if = {
			limit = {
				number_of_personality_traits_in_common = {
					target = scope:actor
					value = 4
				}
			}
			multiply = 4
		}
	}
	desc = we_are_alike_tt
	number_of_personality_traits_in_common = {
		target = scope:actor
		value >= 1
	}
}
modifier = {
	add = 10
	desc = ambition_tt
	has_trait = ambitious
}
modifier = {
	add = 25
	scope:influence_send_option = yes
	desc = INFLUENCE_INTERACTION_ACCEPTANCE_SEND_OPTION
}

As written in game/common/character_interactions/00_adoption.txt.