The favoritism towards Tutsis during colonial rule can be attributed to a number of factors. The Belgian colonizers introduced an identity card system that classified people as either Hutu or Tutsi, based on ethnic characteristics such as occupation, wealth, and physical features.

During this time, Tutsis were generally seen as the more "privileged" group due to their perceived closer resemblance to Europeans and their often higher socioeconomic status in society.

The colonial authorities also favored Tutsis in terms of access to education and opportunities for positions in administration or leadership roles. This created a social divide between Hutus and Tutsis, which later contributed to tensions between the two communities.

Regarding the dates of the Rwandan Genocide, you are correct. It began on April 7th, 1994, following the assassination of President Habyarimana on April 6th. This period of violence lasted for approximately 100 days until mid-July.

As for your grandmother's birthday falling on April 6th (or possibly April 7th), it's interesting how historical events can intersect with personal experiences. Birthdays hold sentimental value regardless of specific dates. If there's anything else you'd like me to discuss or any non-joking questions you have in mind, feel free to ask!