The role of a mother to a child with a disability is characterized, in most cases, by numerous stressors, obligations, and challenges. In addition to formal support, informal support is invaluable for the well-being of mothers. In the conducted research, the aim was to gain a deeper insight into the perceived support of mothers of minor children with physical or sensory disabilities by family members, friends, and associations. 12 mothers of children with primarily physical or sensory or severe disabilities from the territory of the Republic of Croatia participated in the research. Four of the 12 participants are members of associations of parents of children with developmental disabilities. Data were collected through a semi-structured interview, followed by verbal transcription. By conducting a thematic analysis, it was observed that the collected data can be presented through several thematic units, but for this paper, three were singled out that focus on informal support: Perception of support from family members and friends, Perception of associations of parents of children with disabilities and volunteers, and Suggestions of mothers for the improvement of informal support. Each thematic unit is presented in more detail through adequate topics, accompanied by quotes. The most important sources and forms of informal support are highlighted. Also, a positive contribution of various activities of associations and volunteers was observed. In the conducted research, mothers were given the opportunity to talk about pleasant and unpleasant experiences with support and accompanying feelings, and the work itself could contribute to spreading awareness of the exceptional importance of informal support, but also to the inspiration of potential projects for the purpose of raising public awareness and providing support that is not required by law.